The story
- Proto-Indo-European*h₂eHs-der.?
- Proto-Germanic*askǭ
- Proto-West Germanic*askā
- Old Englishæsce
- Middle Englishasche
- Middle Englishaschy
- English todayashy
From Middle English aschy, asshy, equivalent to ash + -y.
Etymology from Wiktionary, CC BY-SA 4.0.